Process of impressing type of a typewriting-machine directly into the mold for making stereotype



TES

UNITED STA PATENT OFFICE.

ALBERT w. SPERLING, or mnnrnnnnnon, onneon.

PROCESS OF IMPRESSING TYPE OF A. T YI 'EWRITING-MACHINE DIRECTLY INTO THE MOLD FOR MAKING STEREOTYPE.

No Drawing.

To all whom it may 00mm.-

Be it known that I, ALBERT W. SPERLING, a citizen of the United States of America, (whose post office address and place of residence is at Independence, Oregom) have invented a new and useful Improvement in Processes of Impressing Type of T pewriting-Machines Directly into the 1V old for Making Stereotype. 1 p

Heretofore molds for making stereotype therefrom have been made by impressions taken from a group of movable type; these type have been set up either by hand orby complicated mechanical c0ntrivances.

An object of the invention is to providea Simple and'economical process whereby an expert typist can be employed instead of a type setter, it being possible for one typ st to do work which by any other method would require the employment of two or more type setters. A further object is to eliminate the ne essity of sortin type, as where ordinary handmethods 0 type setting are employed. n

o carry my invention into effect I take a piece of thin blotting paper and from this p p p enough to hold the impression of the type I prepare my mold as follows i i I place this blotting paper in a bath or solution made of 3 parts of (commercial) sodium silicate and one part of water and leave it soak till it is thoroughly soaked through with the solution which requires about ten minutes. n fl I then take the piece of blotting paper and press out all the surplus liquid by run ning it through a (rubber rollerclothes wringer, with a slightpressure on the rollers and removing all surplus liquid, or that which appears glossy after this, with a dry piece of blotting paper, for any surplus liquid on the mold will clog the type on the typewriting machine.

I then take a thicker piece of dry blotting paper and soak this in a bath 0 glycerin and press out all the surplus glycerin by running it through the wringer.

I then take this piece of blotting paper (soaked in the glycerin) and place it face to face with the blotting paper soaked in the.

sodium silicate and Water bath, and press the two together by running them through the wringer, after this I separate them.

The object of this is to distribute just enough glycerin or oil on the face of the mold to keep the sodium silicate from clog- Specification of Letters Patent.

of the perforate the blotting paper, soaked in the Patented Jan. 18,1921.

, Application filed March 18, 1919. Serial n6. 2153;432.

ging the type on the typewriting machine and also prevent sticking thereof.

I then remove (the ink pad or carbon inked ribbon from the typewriting machine and start a small piece of thin paper, say 4 by 6 inches,,through the typeWriting chine and underneath this, say about one inchsfrom the end of the thin paper, I start blotting paper, soaked in the sodium silicate and water bath, throughthe typewriting machine. The object of this is to start the blotting paper through the type- Writing machine without doubling upthe blotting paper. After the blotting paper is started in the typewriting machine it passes through like'any ordinary writing paper.

I then proceed to type write on the blot ting paper, soaked in the sodium silicate and Water bath, and press a trifle harder on the keys of thetypewriting machinethan I would for ordinary typewriting. The type typewriting machine will impress or sod um sili ate and water bath, tofthe extent of all but a thin filmthat isleft on the bottom of the blotting paper, just thick face of the typewriting machine, and not allow the lead to run througli themold when the stereotype is ast from the mold.

After this the blotting paper or mold as ,it'is now called is arefully removed from the typewriting machine and placedlon a warmer of a temperature of about 125 dek grees, for a few m nu es. The objectof this is to set thesodium sili ate in the moldand prevent it from sticking when placed bemoved from the cast iron plates I proceed to build itup with a compound in order to keep the printing press ink rollers from striking the barren or unlettered parts of the stereotype cast from the mold, which I do as follows :-I take one part of dry flaked glue to about 35 parts of refined whiting by weight, after the glue is dissolved in boilingwater, I mix it with the whiting (grinding it smooth) and thin it with water until the compound is of the right flowing consistence; to flow well and yet not run.

I then strain the compound through a piece of. cheese cloth and then I put the compound in an air pencil or relief bulb, which is a rubber bulb with a spout attached to the same. I then proceed to iiow this compound on the mold with the air pencil between the impressed lines and words of type and the majority of thespa'ce that is not impressed with the type, using a smaller air pencil and a thinner compound between the impressed words and linesof the impressed type, and 'a larger air pencil and a thicker compound on themarg'in and the large vacant spaces that isnot impressed witlithe type, thereby enabling me'to build up the large Vacant spaces considerably higher on the mold with the thicker compound; After the compound on the mold has dried sulliciently on a warmer to prevent sticking, I replace the mold between the cast iron plates and reheat at a low temperature, laying thin sheet of paper and 'a' thin layer of cotton batting on the face of the mold to insure a smooth and leyel mold, and place a slight pressure thereon, anjd when themoisture is dr ed out oi the compound and-the mold, i remove it ft'romthe cast iron plates, and the mold is then ready l'or thestereotypecaster. It the moldsticks tojthe stereotype from slight moisture being therein, the stereotype is placedin hot water till the mold end com- .poundcomes oil of the' stereotype, a'l'ter which the stereotype is ready for the printer. The sodium silicate acts as, a three fold agent, Viz 1st. It softens the blotting paper so that the typefrom'the typewriting machinewill penetrate i t-all but a thin film of the papenjust thick enough to hold the impression of the type. 2nd. It makes the blotting paperhold its shape to the form of theimprint, of the "type; not'allowing the imprint to-spring' back or out of shape.

'3rd. It 'hardens the blotting paper or mold,

after it is pl'ace d between the plates for bakng, making iteasy tohandle and making a kind of fireproofing for the mold while bah ing-it When this: process is used on such ty ew iting machines as t Blickens- V derfer, and other makes of typewriting machines With a type Wheel, or interchangeable type thereon, rapid changes can be made in different sizes and styles of type, thereby giving the printer an almost unlimited rariety of different kinds and styles oi? typc lo select from.

I do not claim the invention of any typewriting machine or tools or any mechanical improvement thereon, that I use with my process.

hat is claimed is 1. The herein described step in the process of producing stereotype molds which consists in saturating a sheet of blotting paper with a solution of sodium 'catc, then rcmoving surplus solution by pressure, and then applying thereto a sheet of blotting paper containing glycerin and subjecting the two sheets to pressure to transfer a iilm of glycerin to the sheet containing sodimn silicate.

2. The herein described step in the ]'JE J 'QS of producing stereotype molds which consists in saturating blotting paper with a solution of sodium silicate and then prcssnng surplus solution therefrom, then applying to the sheet a coating ol glycerin or the li a and then formingin a surface of thr- .shccl impressions of the type oi a typewriting machine or. the like.

ing between smooth surfaces a sheet oi blotting paper or the like containing type impressions and which has been saturated with sodium silicate solution and suriaccd wiih glycerin, then removing the mold from be tween said surfaces and building up tllclcon between the impressions with a mixture oi' glue and whiting.

ALBERKI W. Stlilli L] N l.

Witnesses Cn rronn McBmr-i, C. O. SLorim,

J. G. MoINTosn.

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